#B03F25
Closest named color: Sinopia (#BB3E03). oklch(52.3% 0.153 34.3), rgb(176, 63, 37).
Aa
White text reads best on this color (5.85:1).
About this color
#B03F25 is a medium-dark, vivid red. In OKLCH its lightness is 52%, its chroma 0.153 and its hue 34°. Its hue sits on the warm side of the wheel. The nearest named color is Sinopia (#BB3E03), ΔE 0.027 away. White text reads best on it, at 5.85:1.
| Hue family | Reds |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.153) |
| Temperature | warm |
| Nearest name | Sinopia (#BB3E03) |
| Black text | 3.58:1 |
| White text | 5.85:1 |
Values
| HEX | #B03F25 |
| RGB | rgb(176, 63, 37) |
| HSL | hsl(11, 65%, 42%) |
| OKLCH | oklch(52.3% 0.153 34.3) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #B03F25 | 5.85:1 | AA | Lc -83.7 | Fine for body text |
| Black text on #B03F25 | 3.58:1 | AA large text | Lc 25.7 | Dividers and decoration only |
| #B03F25 text on white | 5.85:1 | AA | Lc 78.4 | Fine for body text |
| #B03F25 text on black | 3.58:1 | AA large text | Lc -23.4 | Dividers and decoration only |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 700.
-
Step 50
50
#FCF3F1
oklch(97.1% 0.01 32.5)
-
Step 100
100
#F8E5E1
oklch(93.6% 0.022 31.8)
-
Step 200
200
#F3D0C7
oklch(88.5% 0.041 34.8)
-
Step 300
300
#ECB0A1
oklch(80.9% 0.074 34.5)
-
Step 400
400
#E0846E
oklch(70.7% 0.118 34.3)
-
Step 500
500
#D56247
oklch(63.2% 0.151 34.5)
-
Step 600
600
#C04428
oklch(55.6% 0.165 34.2)
-
Step 700
700 (this color)
#B03F25
oklch(52.3% 0.153 34.3)
-
Step 800
800
#862D19
oklch(42.7% 0.126 34.1)
-
Step 900
900
#6C2A1B
oklch(37.7% 0.098 34.2)
-
Step 950
950
#401910
oklch(27% 0.063 34.3)
#B03F25 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #5F5521 | 0.157 |
| Deuteranopia (no green cones) | #7B6E21 | 0.143 |
| Tritanopia (no blue cones) | #C2213A | 0.060 |
| Achromatopsia (no color) | #656565 | 0.154 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B03F25
#B03F25
oklch(52.3% 0.153 34.3)
- #00778A
#00778A
oklch(52.3% 0.092 213.9)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #B03F25, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sinopia #BB3E03 ΔE 0.027
- Rusty Red #AF2F0D ΔE 0.027
- Dull Red #BB3F3F ΔE 0.036
- Burnt Umber #A0450E ΔE 0.038
- Russet #A13905 ΔE 0.039
- Brick #A03623 ΔE 0.040
- Cinnamon #AC4F06 ΔE 0.042
- Rust Red #AA2704 ΔE 0.043
Use #B03F25 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.